Lathe.



No. 842,883. PATENTED FEB. 5, 1907.

G. E.'GREENL'EAP.

LATHE.

APPLICATION FILED APB.20,1906.

2 SHEETS-SHEET 1.

Invenr .v w 8 1 mway Witnesses.

No. 842,883. PATENTBD FEB. 5, 1907. G. E. GREENLEAF.

LATHE.

APPLICATION FILED APR.20, 1906.

2 SHEET$SHBET 2.

Inventor I w 0 1, 2

Attorney itnesses.

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GEORGE E. GREENLEAR, or PLAINFIELIZ NEW JERSEY, AssieNoR TO NILESeBEMENT-POND COMPANY, or JERSEY CITY, NEW JERSEY.

LATHE.

Patented Feb. 5, 1907.

To all whom, it may concern.-

Be it known that I, GEORGE E. GREEN- LEAF, a citizen of the United States, residing at Plai'niield, Union county, N ew Jersey, The Pond Machine Tool 00., Plainfield, New Jersey,) have invented certain new and useful Improvements in Lathes, of which the follo ing is a specifi- This. invention relating to improvements in lathes will be readily understood from the following description, 1 taken in connection with the accompanying drawings, in which- Figure l is a front elevation of a lathe with sundry parts omitted, embodying an exemplifica'tion of my invention; Fig. 2, a vertical transverse section of the same in the plane'of line a; F19. 3, a vertlcal longitudinal section through the speed-changing cam in the plane of line 5'; Fig. 4, an end View of a portion of the carriage-apron, the speed-changing rod and the index a pearing in vertical transverse section in t eplane of line 0; Fig. 5, a rear elevation of a portion of the apron; Fig. 6, a plane view of the speed-changing cams; Fig; 7, a diagrammatic or single plane view of the gearing, &c., in the headstock; Fig. 8, a diametrical section of a typical friction clutch suited for employmentin connection with the head-stock gearing, and Fig. 9 a diagram forming virtually in enlarged duplication of Fig. 7 with the clutch-gears appearing in diametrical section.

ing, the details of transmission being imina= terial to the present invention; 8, a gear fast on the lathe-arbor; 9, a first counter-shaft journaled in the -head-stock; 10, a pin-.

ion fast on this counter-shaft and engaging r 1,; ,1. 1 -L" gear 8, 11, la, is, and 121:, gears ooso on ms counter-shaft and each carrying an element ot a clutch; 15, a gear fast with gear 14; 16, the

firstanotion element of the arbor driving mechanism, the same being illustrated in the present case asan electric motor; 1, a pinion driven by the motor and engaging gear 15;

l8, 19, 20, and 21, the clutch elements before referred to as being carried by the four gears loose on the counter-shaft; 22, a second counter-shaft j ournaled in the head-stock; 23, 24,

25, and 26, gears fast on the second countershaft and engaging, respectively, the clutchgears on the first counter-shaft, the several pairs of gears being diversely proportioned with a view to a properly-graduated range of speeds; 27, a clutch member carried by the first counter-shaft and adapted for adjust- 'ment longitudinally of the shaft, so as to serve in looking either gears 12 or 14 alternatively to the shaft, and 28 a similar clutch member on the first counter-shaft to cooperate with the gears 11 and 13.

The clutches may be of any ordinary suitable type, Fig. 8 illustrating a friction-clutch of a form common in the market, in which the shifting of a circumferentiallygrooved ring one way or the other from the neutral position serves in bringing about the expansion, alternatively, oiitwo split rings serving in frictionally locking either of the two gears to the shaft on which the gears are loosely mounted.

At this point it will be ap rehended, from a consideration of Fig. 9, tiat motor 16- runs at constant'speed and the two clutches 27. and 28 be in released position the four gears 11, 12, 13, and'le'will turn idly on first counter-shaft 9. If now clutch 28 be thrown to the left, gear 11 will become locked to the first counter-shaft and that counter-shaft will turn and through the medium of gears 10 and 8 transmit motion to the lathe-arbor a at given rate. This condition represents the lowest speed-step in the system. If, however, clutch 28 be released from ear 11 and clutch 27 be thrown to gear 12, then the motion" will be transmitted to the lathe-arbor at a higher rate than before. If now clutch 27 be released from ear '12 and clutch-28 be thrown to gear 13, then the lathe-arbor will be driven at a still higher rate. Thus far in the three selections of speed for the lathearbor the second counter-shaft 22, with its gearing, has served as a transmitting agent, and, in virtue of its diversity of caring, as a determining a ent for the rate Q speed.- If,

however, 'clutc' 28 be released and clutch 27 be thrown to the left, then gear 15 will be locked to the first counter-shaft and motion will be transmitted to the lathe-arbor at still higher ratethan in any of the previous cases,

and under this condition the second counter-- shaft 22, withits gears, is without. oihce. It

isthus seen that four'selective speeds are available for the lathe-arbor, While a constant speed is imparted to pinion 17, the speed for the lathe-arbor being dependent on which of the two clutches is thrown and in which direction it is thrown. it may be here stated that the particular transmission systern illustrated is exemplifying only and is manifestly susceptible of great extension an I variation.

Proceeding with the drawings, 29 indicates a sleeve mounted for free rotation, being'inthe present case mounted loosely on the leadscrew near its head end; 30, a circumferentially-grooved cam on this sleeve; 31, a second circumlerentially-grooved cam on this slee 32, splined rodjournaled onthe no u oi the lathe-bed and extending the length. of the carriage travel thereon; 33 and 34, ars connecting this splined rod with. the sleeve 29; 35, a pair of shafts journaled in the head-stock at right angles to the countershal ts; 3(5, arms fast on these shafts and hav ing rollers at their free ends engaging the grooves ol the cams on sleeve 29, and 3? arms carried by shafts 35 and engaging the shifting clutches on the first counter-shaft.

"he cams 3i.) and 31, as Will be apprehend ed from study of Fig. 6, have their throwinc points so disposed in relation to each otuer that :29 will first throw one of the clutches in one direction, then release it and throw the second clutch in one direction, and then re lease the second clutch and. throw the first clutch in the direction opposite its first throw- "1g, and then release the lirst clutch and throw the second clutch in the direction op posite its first throwing, the turning of the sleeve through a proper angle thus putting the speed-selecting mechanism through all of its paces. The sleeve is turned to proper angular position by the turning of splined rod 32, and the speed for the lathe-arbor depends on which of the several cam-lobes is brought into action.

Continuing with the drawings, 38 indicates a gear journalcd on the carriage-apron and splined on rod 3'3 39, an index-disk mounted on thel lb of this gear and bearing a circumierential series of designations indicative,re-

, spectivel v, of the several cam-lobe activities;

40-, a journaledin the carriageepron and engaging gear 38 of the splincd red, the. in the present case being illustrated as of angle tv' with such proportioning that gear 4-0 mans four turns for one turnv of gear 38; 4-1., a crank on the spindle ot'gear 40 at the front of the apron; t3, the handle of this crash 4-93, deten t-pi n carriedh the handle, and two detent-recesscs to be engaged if the d, tent-pin.

The turning oi crank ll obviously results in the turning of the carn-sleve'and in the successive rockings, one Way and the other,

of the clutch-throwing arms '36.. In the continued angular advance of selectively i illustrated example the lobes of the cams, taken collectively, are equally distributed circumferentially, and as there are four throwing-points provided by the two cams it follows that each quarter-turn of the cam sleeve will effect a change from one'clutch tlu'owing point to the next one, and consequently from one lathe speed to the next one. if gears and 34 be equal, as is illustrated,

then gears 38 and 40, being in the proportion of four to one, it follows that a full turn for crank 4&1 brings ahoiit a quarterturn for. the cams. One of the detent-holes for crank 4 is employed for each ofthefour diihirent. speed adjustments, the other detent-holes serving forthe disengaged condition of botlr clutches. The exposed symbol on the index- ,disl; designates such active speed condition as may have been adjusted for by means; of the crank. The gearing connecting handle ll with the splined rod isof angle or spiral type and when properly proportioned and constructed has the, merit of ransmitting the crank motion smoothly and po *erfully and of bringing the axis of the crank at right angles to that of the rod and the proportioning of the spiral gear or Worm, whichever it may be such as to cause the device to be self-hold ingthat is to say, the reaction on the cams will not result in their angular displacement.

It is to be observed that the construction provides for the complete and continued rotation of the cams by motion of the adjustling-handle in one direction, the handle hav ing two positions, one representing gearinginactivity and the other representing all gearing idlel Giving to the handle a continued motion oi" angular advance thus uts the selection of speeds through a range of gradual increase from minimum to. maid mum, and the range having been completed a stoppingpoiu t is found for the handle preliminary to again beginning the range at the minimum.

The rod-turning device specifically illustrated will be round adequate and-Connnendable; but it is manifest that as their purpose is merely to provident the lathe-carriageconvenient means for turningthe rod the contrivance of numerous substitutes for them is well Within the capacity of'those skilled in the. art of lathe construction with out departing from the principle .of my inventi'on.,

All of the specific details illustrated are to be considered as exemplifying only'and as showingsimply the best mode in which I at present .conteniplatejapplying the principle of myinvention 1. in avlathe, the combination, substantially asset forth, of a bed, a carriage, a head stock, a lathdatrbor, alirst-motion part for imparting auction to the latheeflmr, select be called, on the axis of the crank may;

ive transmission-gears between said firstmotion part and lathe-arbor, a lead-screw, clutches for bringing said gears seleetlvely into action, arms ior throwing said clutches,

I rotary cams mounted loosely on the leadsaid handle and rod whereby the turning 'of' the handle brings about the turning of the cams and thebjringing of the clutches selectively into action.

-2. In a lathe, the combination, substan- I t'ially asset forth, 'of a bed, a carriage, a headstock, a lathe-arbor, a first-motion part for i nparting niotion to the lathe-arbor, selectijfxe transmission-gears between said 'firstmotion part and lathe-arbor; clutches for I bringing said gears selectively into action, arms or engaging and dlsengaging said clutches, a completely rotary cam for each arm, each of said earns having a plurality of lobes each of Which Will actuate its arm, means rigidly uniting the cams so that their lobes together form a complete circular series of lobes in which the lobes on one cam alternate with those on the other earn, a splined rod journaled on the lathe-bed, connections between said rod and earns, a completely rotary handle carried by the lathe-carriage, connections between said handle and rod whereby the continuous turning of the hen: (lle brings about the continuous turning of the cams, and means for .loelring'the handle ,in positions corresponding, with the idle and active positions of the earn-lobes.

GEORGE E. GREEN-LEAF.

-W itnesses v J. B. CoWARD, H. H. HOFFMAN. 

